Work rest for centerless grinders



March 15, 1949. H. R. HERBS TER 2,464,246

WORK REST FOR CENTERLESS GRINDERS Filed Jan. 13, 1947 INVENTOR. HARRY R. HERBS TEE j amvq Patented Mar. 15, 1949 UNITED STATES PATENT OFFICE WORK BEST FOR CENTEELESS GBINDERS Harry R. Herbster, Cleveland, Ohio Application January 13, 1947, Serial No. 721,773

Claims.

The present invention relates to an improved work rest for a centerless grinder.

Heretofore Work rests for centerles-s grinders consisted of a bar of hardened steel having a base adapted to be bolted to the bed of the grinder and having an integral upwardly projecting blade portion for supporting the work between the grinding and work rotating wheels. Each work supporting blade included the base formed integral therewith and these blades were relatively expensive as they utilized considerable hardened. steel.

An object of the present invention is to provide a work rest for centerless grinders consisting of a base bar, that can be attached to the bed of the grinder, and a hardened steel blade that can be securely attached to the bar, the blade serving to support the work. The blade is removable so that blades of dilierent dimensions can be attached to the same base bar.

Other objects and advantages of the invention will be apparent from the following description of a preferred form of embodiment of the invention, reference being made to the accompanying drawings wherein;

Fig. 1 is a fragmentary view in elevation of a centerless grinder;

Fig. 2 is a side view, partly broken away, of an improved work rest; and

Fig. 3 is a view in section taken on line 3--3 of Fig. 2.

For the purposes of illustrating my invention, I have shown the bed, grinding and work rotating wheels and the work rest of a centerless grinder. The other details of the grinder have been omitted from the drawing as they may be of well known constructions.

Referring now to the drawings, the bed of the grinder is indicated at I0. The grinder wheel I I and the work rotating wheel I2 are shown above the bed and they are mounted and driven by suitable mechanism not shown. The work rest is indicated generally at I4 and it is adapted to support a work piece l5 between the wheels II and I2.

The work rest 14 comprises an elongated, relatively flat bar i1 that is adapted to be received in an elongated slot [8 formed in a block !9 that is bolted to the bed H] by bolts, two of which are shown at 20. Set bolts, one of which is shown at 2!, are threaded into the block l9 and serve to clamp the bar I! in the slot l8 to removably secure the bar to the bed of the grinder. The bar I! is preferably formed of cold rolled steel, although any suitable material could be used, and

2 an elongated slot 22 is formed in the bar. The slot preferably extends short of the bottom edge of the bar for forming a bottom wall to the slot. The inner end wall 24 of the slot 22 is at an acute angle with the contiguous side wall 25, the purpose of which angle will be apparent as the description proceeds. The opposite end wall of the slot is preferably normal to the longitudinal side walls of the slot. A threaded opening 26 is formed in the end of the bar I! and it extends into the outer end of the slot 22. A set screw 21 is threaded into the opening 26, the purpose of which screw will be explained presently. Preferably a plurality of holes 28 are formed in the bar I! extending from the bottom of the slot to the bottom edge of the bar. These holes enable the insertion of tools to knock parts out of the slot.

A work supporting blade 30 is adapted to fit into the slot 21 and to be secured therein. The blade 30 is formed of hardened steel, and the upper edge 3! is adapted to support the work between wheels H and Ill. The end edges 3! and 32 of the blade at the lower portion thereof are formed at one acute angle to one of the surfaces of the The angle formed by the edge 3| with the mentioned surface is the same as the angle between the slot walls 24 and 25 so that the blade will fit into the end of the slot.

To secure the blade 30 in the bar H, the blade is placed in the slot with edge 3| against the end wall 24 of the slot and a wedge block 35 is placed in the slot beside the blade. The block 35 has an end edge 35 that is formed at an angle complementary to the edge 32 of the blade, as shown in Fig. 3. Set screw 21 is then turned to force the block 35 longitudinally in the slot 22 for pressing the blade to the end wall 24 of the slot. The end wall 24 of the slot and the abutting edge 3! of the blade cooperate, in response to the pressure exerted on block 35, to press the surface of the blade tightly against the wall 25 of the slot, as does the cooperation of surfaces 32 and 36 of the blade 30 and block 35, respectively. Thus, the blade 30 may be firmly and securely locked in the bar IT. The blade 30 may be replaced by blades of other dimensions but being adapted to fit into the slot and having edges corresponding to edges 3| and 32. Wedge blocks of different lengths may be provided for securing blades occupying more or less of the slot 22.

In the event either the blade or wedge block stick in the slot, they can be driven free by inserting a rod through one of the holes 28 and taping the rod upwardly against the bound member.

It will be apparent that by my invention I have provided a work rest for centerless grinders which reduces the use of material and labor and thereby substantially lowers the cost over the usual type rests. Although the rest is inexpensive, it provides the requisite stability for supporting the work.

Although I have described but one form of the invention, other forms may be adopted, all falling Within the scope of the following claims.

I claim:

1. A work rest for a centerless grinder comprising, an elongated base bar adapted to be attached to the bed of the grinder, said bar having an opening therein extending longitudinally relative thereto said opening extending downwardly from the top of the bar a substantial distance into the bar and being generally rectangular in crosssection; a work supporting blade adapted to fit in said opening and have a part extending laterally from the bar for supporting work; and means for pressing said blade against one end wall of said opening for frictionally attaching said blade to the bar.

2. A work rest for a centerless grinder comprising, an elongated base bar adapted to be at tached to the bed of the grinder, said bar having an opening therein extending longitudinally relative thereto said opening extending downwardly from the top of the bar to provide a vertically extending cavity having side and end walls; a Work supporting blade adapted to fit in said opening and have a part extending vertically from the bar for supporting work; means for pressing blade to one end wall or said opening including cam means disposed within and at one end of the opening for urging said blade laterally into tact with a longitudinal wall of said opening.

3. A work rest for a centerless grinder con1- prising, an elongated base bar adapted to be attached to the bed of the grinder, said bar having a longitudinally extending opening therein, one end wall of the opening extending at an acute angle with a contiguous longitudinal wall of said opening; a work supporting blade having a portion thereof adapted to be received in said opening, one end edge of said blade being at an acute angle with a contiguous side surface of the blade, the latter angle being substantially the same as the first mentioned angle whereby the said one end of the blade is complementary in form to said one end of said opening; and means pressing said blade in the direction of said one end of the opening for urging the complementary parts of said blade and the Walls of said opening into frictional engagement.

4. A work rest for a centerless grinder comprising, an elongated base bar adapted to be attached to the bed of the grinder, said bar having a longitudinally extending opening therein, one end wall of the opening extending at an acute angle with a contiguous longitudinal wall of said opening; a Work supporting blade having a portion thereof adapted to be received in said opening, one end edge of said blade being at an acute angle with a contiguous side surface of the blade, the latter angle being substantially the same as the first mentioned angle whereby the said one end of the blade is complementary in form to said one end of said opening; a block in said opening at one end of the blade, said block having a cam surface engaging said blade; and means for urging said block toward said blade, said cam surface urging said blade against a longitudinal wall of said opening.

5. A work rest for a centerless grinder comprising, an elongated base bar adapted to be attached to the bed of the grinder, said bar having a longitudinally extending slot therein, one end wall of the opening extending at an acute angle with a contiguous longitudinal wall of said slot; a work supporting blade having a portion thereof adapted to rest in said slot, one end edge of said blade being at an acute angle with a contiguous side surface of the blade, the latter angle being substantially the same as the first mentioned angle whereby the said one end of the blade is complementary in form to said one end of said opening for forming camming surfaces for urging the blade against said longitudinal wall of the slot, when the blade is urged against said end wall; a block in said slot at the end opposite said one end of the blade, said block and blade having cam surfaces cooperating to urge said blade laterally against said longitudinal wall when the cam is forced against the blade; and means for urging said block toward said blade.

HARRY R. HERBSTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,691,061 Heim Nov. 13, 1928 2,243,871 Blood May 27, 1941 2,417,413 Hopkins Mar. 18, 1947 FOREIGN PATENTS Number Country Date 306,177 Great Britain Feb. 18, 1929 

